Cover for an indicator lamp



FIG. 1 is a perspective view of a cover for an indicator lamp showing our new design;

FIG. 2 is a front view thereof, the rear view being identical to FIG. 2;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a right side view thereof, the left side view being identical to FIG. 5.

The broken lines depict unclaimed environmental subject matter. The fine discontinuous lines in the drawings are not a pattern. 

The ornamental design for a cover for an indicator lamp, as shown. 